| `NC_DB` | See our example database URLs [here](https://github.com/nocodb/nocodb#docker). | A local SQLite database will be created in root folder if `NC_DB` is not provided |
| `NC_DB_JSON` | Can be used instead of `NC_DB` and value should be valid knex connection JSON | |
| `NC_DB_JSON_FILE` | Can be used instead of `NC_DB` and value should be a valid path to knex connection JSON | |
| `DATABASE_URL` | Can be used instead of `NC_DB` and value should be in JDBC URL format | |
| `DATABASE_URL_FILE` | Can be used instead of `DATABASE_URL` and value should be a valid path to file containing JDBC URL format. | |
| `NC_AUTH_JWT_SECRET` | JWT secret used for auth and storing other secrets | A random secret will be generated |
| `PORT` | For setting app running port | `8080` |
| `NC_TOOL_DIR` | App directory to keep metadata and app related files | Defaults to current working directory. In docker maps to `/usr/app/data/` for mounting volume. |
| `NC_PUBLIC_URL` | Used for sending Email invitations | Best guess from http request params |
| `NC_JWT_EXPIRES_IN` | JWT token expiry time | `10h` |
| `NC_INVITE_ONLY_SIGNUP` | Removed since version 0.99.0 and now it's recommended to use [super admin settings menu](/account-settings/oss-specific-details#enable--disable-signup). Allow users to signup only via invite URL, value should be any non-empty string. | |
| `NUXT_PUBLIC_NC_BACKEND_URL` | Custom Backend URL | `http://localhost:8080` will be used |
| `NC_REQUEST_BODY_SIZE` | Request body size [limit](https://expressjs.com/en/resources/middleware/body-parser.html#limit) | `1048576` |
| `NC_EXPORT_MAX_TIMEOUT` | After `NC_EXPORT_MAX_TIMEOUT`, CSV gets downloaded in batches | Default value `5000` (in milliseconds) will be used |
| `NC_SMTP_HOST` | For SMTP plugin - SMTP host value | |
| `NC_SMTP_PORT` | For SMTP plugin - SMTP port value | |
| `NC_SMTP_USERNAME` | For SMTP plugin (Optional) - SMTP username value for authentication | |
| `NC_SMTP_PASSWORD` | For SMTP plugin (Optional) - SMTP password value for authentication | |
| `NC_SMTP_SECURE` | For SMTP plugin (Optional) - To enable secure set value as `true` any other value treated as false | |
| `NC_SMTP_IGNORE_TLS` | For SMTP plugin (Optional) - To ignore tls set value as `true` any other value treated as false. For more info visit https://nodemailer.com/smtp/ | |
| `NC_S3_BUCKET_NAME` | For S3 storage plugin - AWS S3 bucket name | |
| `NC_S3_REGION` | For S3 storage plugin - AWS S3 region | |
| `NC_S3_ACCESS_KEY` | For S3 storage plugin - AWS access key credential for accessing resource | |
| `NC_S3_ACCESS_SECRET` | For S3 storage plugin - AWS access secret credential for accessing resource | |
| `NC_ATTACHMENT_FIELD_SIZE` | For setting the attachment field size(in Bytes) | Defaults to 20MB |
| `NC_MAX_ATTACHMENTS_ALLOWED` | Maximum Number of attachments per cell | |
| `NC_ADMIN_EMAIL` | For updating/creating super admin with provided email and password | |
| `NC_ADMIN_PASSWORD` | For updating/creating super admin with provided email and password. Your password should have at least 8 letters with one uppercase, one number and one special letter. Allowed special characters include `$&+,:;=?@#\|'.^*()%!_-"`. ) | |
| `NODE_OPTIONS` | For passing Node.js [options](https://nodejs.org/api/cli.html#node_optionsoptions) to instance | |
| `NC_MINIMAL_DBS` | Create a new SQLite file for each project. All the db files are stored in `nc_minimal_dbs` folder in current working directory. (This option restricts project creation on external sources) | |
| `NC_AUTOMATION_LOG_LEVEL` | Possible Values: `OFF`, `ERROR`, `ALL`. See [Webhooks](/automation/webhook/create-webhook#call-log) for details. | `OFF` |
| `NC_SECURE_ATTACHMENTS` | Allow accessing attachments only through presigned urls. To enable set value as `true` any other value treated as false. (⚠ this will make existing links inaccessible ⚠) | `false` |
| `NC_ATTACHMENT_EXPIRE_SECONDS` | How many seconds before expiring presigned attachment urls. (Attachments will expire in at least set seconds and at most 10mins after set time) | 7200 (2 hours) |
| `NC_ALLOW_LOCAL_HOOKS` | To enable set value as `true` any other value treated as false. (⚠ this will allow webhooks to call local links which can raise security issues ⚠) | `false` |
| `NC_SANITIZE_COLUMN_NAME` | Sanitize the column name during column creation. To enable set value as `true` any other value treated as false. | `true` |
| `LITESTREAM_S3_ENDPOINT` | URL of an S3-compatible object storage service endpoint like `s3.eu-central-1.amazonaws.com`. | *Litestream replication is disabled if this variable is not set.* |
| `LITESTREAM_S3_BUCKET` | Name of the S3-compatible object storage bucket to store the Litestream replication in. | *Litestream replication is disabled if this variable is not set.* |
| `LITESTREAM_S3_PATH` | Directory path to use within the Litestream replication bucket. | Defaults to `nocodb`. |
| `LITESTREAM_S3_ACCESS_KEY_ID` | Litestream authentication key for the S3 replica. | *Litestream replication is disabled if this variable is not set.* |
| `LITESTREAM_S3_SECRET_ACCESS_KEY` | Litestream authentication key for the S3 replica. | *Litestream replication is disabled if this variable is not set.* |
| `LITESTREAM_S3_SKIP_VERIFY` | Whether to disable TLS verification. This is useful when testing against a local node such as MinIO and you are using self-signed certificates. | Defaults to `false`. |
| `LITESTREAM_RETENTION` | Amount of time Litestream snapshot and WAL files are kept. After the retention period, a new snapshot is created and the old one is removed. WAL files that exist before the oldest snapshot will also be removed. | Defaults to `1440h` (60 days). |
| `LITESTREAM_RETENTION_CHECK_INTERVAL` | Frequency in which Litestream will check if retention needs to be enforced. | Defaults to `72h` (3 days). |
| `LITESTREAM_SNAPSHOT_INTERVAL` | Frequency in which new Litestream snapshots are created. A higher frequency reduces the time to restore since newer snapshots will have fewer WAL frames to apply. Retention still applies to these snapshots. | Defaults to `24h` (1 day). |
| `LITESTREAM_SYNC_INTERVAL` | Frequency in which frames are pushed to the Litestream replica. Increasing this frequency can increase object storage costs significantly. | Defaults to `60s` (1 minute). |
